libxml2 startswith

Building libxml2 for armeabi-v7a
Traceback (most recent call last):
  File "/usr/lib/python2.7/runpy.py", line 162, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "/home/yash/test/.buildozer/android/platform/python-for-android-master/pythonforandroid/toolchain.py", line 871, in <module>
    main()
  File "/home/yash/test/.buildozer/android/platform/python-for-android-master/pythonforandroid/toolchain.py", line 868, in main
    ToolchainCL()
  File "/home/yash/test/.buildozer/android/platform/python-for-android-master/pythonforandroid/toolchain.py", line 494, in __init__
    getattr(self, args.subparser_name.replace('-', '_'))(args)
  File "/home/yash/test/.buildozer/android/platform/python-for-android-master/pythonforandroid/toolchain.py", line 147, in wrapper_func
    build_dist_from_args(ctx, dist, args)
  File "/home/yash/test/.buildozer/android/platform/python-for-android-master/pythonforandroid/toolchain.py", line 190, in build_dist_from_args
    build_recipes(build_order, python_modules, ctx)
  File "pythonforandroid/build.py", line 564, in build_recipes
    recipe.build_arch(arch)
  File "/home/yash/test/.buildozer/android/platform/python-for-android-master/pythonforandroid/recipes/libxml2/__init__.py", line 18, in build_arch
    with current_directory(self.get_build_dir(arch)):
  File "pythonforandroid/recipe.py", line 329, in get_build_dir
    return join(self.get_build_container_dir(arch), self.name)
  File "pythonforandroid/recipe.py", line 318, in get_build_container_dir
    return join(self.ctx.build_dir, 'other_builds', dir_name, arch)
  File "/usr/lib/python2.7/posixpath.py", line 68, in join
    if b.startswith('/'):
AttributeError: 'ArchARMv7_a' object has no attribute 'startswith'